51366666 has 16 divisors (see below), whose sum is σ = 110636064. Its totient is φ = 15805104.

The previous prime is 51366661. The next prime is 51366677. The reversal of 51366666 is 66666315.

51366666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

51366666 is a modest number, since divided by 6666 gives 5136 as remainder.

It is not an unprimeable number, because it can be changed into a prime (51366661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329196 + ... + 329351.

It is an arithmetic number, because the mean of its divisors is an integer number (6914754).

Almost surely, 2^51366666 is an apocalyptic number.

51366666 is an abundant number, since it is smaller than the sum of its proper divisors (59269398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51366666 is a wasteful number, since it uses less digits than its factorization.

51366666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658565.

The product of its digits is 116640, while the sum is 39.

The square root of 51366666 is about 7167.0542065761. The cubic root of 51366666 is about 371.7295843756.

The spelling of 51366666 in words is "fifty-one million, three hundred sixty-six thousand, six hundred sixty-six".